On 9/28/26 10:53, David Hildenbrand (Arm) wrote: > On 9/26/26 14:41, Donggeun Yoo wrote: >> Move a swapped-out page out of a write-protected or RWP-protected area into >> a destination registered for missing faults only, and read pagemap bit 57 >> at the destination. The destination was never protected, so the bit must >> be clear. >> >> Assisted-by: LLM >> Signed-off-by: Donggeun Yoo <[email protected]> >> --- >> tools/testing/selftests/mm/uffd-unit-tests.c | 84 ++++++++++++++++++++ >> 1 file changed, 84 insertions(+) >> >> diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c >> b/tools/testing/selftests/mm/uffd-unit-tests.c >> index ef9b3956bdcfd..580178630eded 100644 >> --- a/tools/testing/selftests/mm/uffd-unit-tests.c >> +++ b/tools/testing/selftests/mm/uffd-unit-tests.c >> @@ -2037,6 +2037,75 @@ static void >> uffd_move_pmd_split_test(uffd_global_test_opts_t *gopts, uffd_test_a >> uffd_move_pmd_handle_fault); >> } >> >> +/* >> + * Moving a swapped-out page out of a write-protected or RWP-protected area >> + * must not carry the uffd bit into a destination registered for missing >> + * faults only: such a bit is never cleared afterwards, so pagemap keeps >> + * reporting the page as uffd-tracked. >> + * >> + * Needs a swap device; skipped if MADV_PAGEOUT cannot evict the page. >> + */ >> +static void uffd_move_swap_test_common(uffd_global_test_opts_t *gopts, >> + bool rwp) >> +{ >> + unsigned long page_size = gopts->page_size; >> + struct uffdio_move move = { }; >> + int pagemap_fd; >> + >> + if (rwp) { >> + if (uffd_register_rwp(gopts->uffd, gopts->area_src, page_size)) >> + err("register src failure"); >> + } else if (uffd_register(gopts->uffd, gopts->area_src, page_size, >> + false, true, false)) { >> + err("register src failure"); >> + } > > if ()
Clicked sent by accident ... let me reply once more. -- Cheers, David
